Hi!
I had the same problem as you on my PSP 3000. What I came up with was easy, I completely removed the broken socket from the motherboard (until the solder pads it was stuck to were accessible). The I cut the matching connector from the ends of the plug component. Then I soldered it directly to the motherboard.
I hope I won't ever have to change the plug itself, cause that would mean replacing the board as well at this point.
I'm not sure what other options you explored, but this one won't cost you anything and it's not that difficult to do.